Chris Madel, a Minneapolis lawyer who represented the immigration agent who fatally shot Renee Good, said Monday that he was ending his Republican campaign for governor of Minnesota after a second protester was killed by federal authorities.

“I cannot support the national Republicans’ stated retribution on the citizens of our state,” Madel said in a video message he posted on social media, “nor can I count myself a member of a party that would do so.”

Madel, who has never held elected office, launched his candidacy in December as a political outsider and a fierce defender of law enforcement. One of nearly a dozen candidates in the Republican primary for governor, Madel had been endorsed by the Police Officers Federation of Minneapolis.